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Asatrian, H.M.; Greub, C.; Kokulu, A.; Yeghiazaryan, A. (2012). Next-to-leading logarithmic QCD contribution of the electromagnetic dipole operator to B̅ →Xsγγ. Physical review. D - particles, fields, gravitation, and cosmology, 85(1), p. 14020. Melville, N.Y.: American Physical Society 10.1103/PhysRevD.85.014020